Ground Level Photos: Ground level photos can either refer to aerial photos taken where the lens is level with the ground or to photos taken where the camera is placed within a few inches of the ground and photo are taken from that perspective
ground_level.jpg
Ground Level

Oblique Photos: Oblique Aerial photos are photos taken from an aerial platform where the camera has more than 3 degrees of tilt.

oblique.jpg
Aerial photos: Taken from vertically above the point, very high up in the air.
Aerial.jpg
Satellite photos: Taken from space vertically above the point, can zoom in. Higher then Aerial photossatellite.jpg